<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>作业1 - 表格</title>
    <style>
        table {
            border-collapse: collapse;  
        }

        table,td,th {
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <table>
        <!--- 表头 -->
        <tr>
            <th colspan="3">菜价单</th>
        </tr>
        <tr>
            <td rowspan="4">序号</td>
            <td>菜名</td>
            <td>菜价</td>
        </tr>
        <tr>
            <td>白菜</td>
            <td>3￥</td>
        </tr>
        <tr>
            <td>青菜</td>
            <td>3￥</td>
        </tr>
        <tr>
            <td>芹菜</td>
            <td>3￥</td>
        </tr>
    </table>
</body>
</html>